Pump structure for outboard motors



April 10, 1951 D. A. ARMSTRONG 2,548,762

PUMP STRUCTURE FOR OUTBOARD MOTORS Filed Feb. v, 1946 2 Sheets-Sheet 2lnv6n'tor' I i DANIELAHRMST ONG,

Patented Apr. 10, 1951 PUMP STRUCTURE FOR OUTBOARD MOTORS Daniel A.Armstrong, Minneapolis, Minn., assignor to Scott-Atwater ManufacturingCompany, Minneapolis, Minn., a partnership composed of Horace B. Atwaterand Clifford E. Scott Application February 7, 1946, Serial No. 646,08 7

4 Claims. (01. 115-17) This invention relates to an outboard motor andparticularly to portions of said motor comprising a pump. It is commonin outboard motors to have a circulation of cooling water for the motorcylinders and adjacent parts, and for this purpose it is desirable tohave a pump for positively circulating said water.

It is an object of this invention to provide a very simple, compact andefficient structure of water circulating pump.

It is a further object of the invention to provide a structure of pumpfor an outboard motor, which motor has a drive shaft, a drive shafthousing, a propeller shaft housing below and secured to said drive shafthousing, one of said housings having a chamber therein adjacent theother and a pump impeller in said chamber driven from said drive shaft.

It is another object of the invention to provide a water circulatingpump structure for an outboard motor comprising a drive shaft, a driveshaft housing, a propeller shaft housing below and secured to said driveshaft housing and having a chamber extending horizontally therein, adriven pump element in said chamber, and means for driving said elementfrom the drive shaft.

It is more specifically an object of the invention to provide anoutboard motor structure having a drive shaft, a drive shaft housing, apropeller shaft housing below and secured to said drive shaft housing,and a water circulating pump disposed substantially between saidhousingsand driven by said drive shaft.

It is also an object of theinvention to provide an outboard motorstructure comprising a drive shaft, a drive shaft housing, a propellershaft housing below and secured to said drive shaft housing, a propellershaft journaled in said propeller shaft housing, a plate which may be ananti-cavitation plate between said housings, a chamber in one of saidcasings adjacent said plate, and a pump impeller in said chamber drivenfrom said drive shaft.

These and other objects and advantages of the invention will be fullyset forth in the following description made in connection with theaccompanying drawings in which like reference characters refer tosimilar parts throughout the several views and in which:

Fig. '1 is a vertical section through the lower portion of an outboardmotor taken substantially on line I-I of Fig. 2, a s'indicated by thearrows Fig. 2 is a horizontal section taken substantially on line 2'2 ofFig. 1, as indicated by the Fig. 3 is a horizontal section takensubstantially on line 3-3 of Fig. 1, as indicated by the arrows;

Fig. 4 is a vertical section taken on line 4-4 of Fig. 3, as indicatedby the arrows; and

Fig. 5 is a plan view of an impeller and driving cam therefor.

Referring to the drawings, an outboard motor structure is showncomprising a propeller shaft housing I0 which will preferably be in theform of a casting, which member is secured by a stud I2 to the exhaustand driveshaft housing I 3. Member Ill is also secured to said housingI3 by a nutted stud I4 threaded into a lug or boss on member I3. StudsI2 and I4 are equipped at the lower ends with nuts and split springlocking washers I5. Member I0 has secured thereto by headed screws I! a.removable member I8. A gasket (not shown) may be disposed betweenmembers I0 and I8. Screws I1 are supplied with split spring Washers I9beneath the heads thereof. Member I0 is provided with bearing bushings20 in which is journaled a motor drive shaft 2 I. A beveled gear 22 issplined to the lower end of shaft 2I and engages the lower bushing 20.Gear 22 meshes with another beveled gear 23 keyed to a propeller shaft24. Shaft 24 is journaled at one end in a flanged bushing 26 seated in abore in member I8. Gear 23 engages the flange of bushing 26. Gear 23 isengaged at its rear end by a collar 24a on shaft 24 and said shaft isalso journaled in a bushing 21 carried in a hub Illa of casting I0.Casting I0 has a recess I0b at one side in which is disposed a suitablepacking and sealing member 28. A propeller 30 is secured to the end ofshaft 24, said shaft being threaded at its end to receive a nut 3|engaging propeller 30. The lower end of casting I0 is formed as a skegIllc.

In accordance with the present invention member ID is provided at itsupper end with a chamber Hid. A plate 32 overlies chamber Ifld and isdisposed between members I0 and I3 and traversed by studs I2 and I4.Plate 32 forms the top of chamber Hid and also constitutes ananti-cavitation plate. Plate 32 is provided with an opening for thepassage of shaft 2|, and a thin washer 33 which may be of fibrousmaterial or stainless steel fits about shaft 2| and is disposed at theunderside of plate 32 to provide means for preventing abrasion of plate32. Washer 33 has prongs 33a disposed in holes 32b in plate 32 toprevent rotation thereof. A similar thin washer 34 surrounds shaft 2Iand overlies the top of the upper bushing 20 to prevent abrasion of thelatter. Disposed between the washers 33 and 34 and secured to shaft 2!by a suitable means such as by silver soldering is an eccentric disk 31.Disk 31 is cylindrical in form and as shown in Figs. 2 and 3 is mountedeccentrically to shaft 2|. Cam 3'! fits. in a bore in a pump rotor orimpeller 38. Member 38 will preferably be made of rubber composition orrubber-like material to prevent injury thereto by any solid particleswhich may be carried by the water. Impeller 38 is of general cylindricalform and is provided with a radially extending arm 38a. Arm 38a isdisposed between the curved side of a lug Hie upstanding from the bottomof chamber Hid and the convex side of a curved rib l extending from thewall ofcasing Hid.

The impeller or rotor 38 is thus mounted. so that it can oscillate orgyrate upon rotation of shaft 2| and cam 31. upstands from the bottom ofchamber ltd and extends in circular form about a large portion ofimpeller 38. The inner wall of rib lug is cylindrical and of somewhatlarger diameter than the outer diameter of impeller 38. One end of therib Hig is spaced some distance from the end of the curved rib if toprovide an inlet opening liih to the pumping. chamber within rib Ilig. Arib or partition l-lii extends from rib lg to the wall of easing llidand a water inlet chamber Ilia is thus formed within chamber led. Thestud l2- passes through a lug Ink formed in member ID, and the wall ofchamber llid at the sides of said lug is provided with a plurality ofopenings Him for the entry of water into the chamber ii. A screen 40 isdisposed about the wall of chamber Hi7 over the openings Him and engagesat its ends spaced lugs I011 formed on member Hi. Another rib I00extends from the rib 109 to the wall of casing iiid some distance fromthe rib llii, and a discharge opening [Up is formed from the pumpingchamber within rib llig between said rib I00 and the lug 10c. Adischarge chamber liiq for the water is thus formed within chamber Hid.Plate 32 has an opening 32a alined with a portion of chamber Hiq' and adischarge pipe H is secured in an opening in housing I3 alining with theopening 320.. A sealing member 42 is disposed in a recess in housing I3about the lower end of pipe 4!.

In operation shaft 2! will be driven from the motor and. this willrotate gears 22 and 23 and thus shaft 24 so that propeller 30 will bedriven. The rotation of shaft 21 rotates disk 3'! and this causes anoscillating movement of impeller 33, the arm 38a pivoting betweenportions [Be and if. Water enters the inlet chamber I09 through theopenings Him and through screen 40 and this water passes through theinlet passage liih between the inner wall of portion llig and impeller38 when the impeller is in its lower position, as seen in Fig. 2. As theimpeller oscillates, the water moves about impeller 38 in a clockwisedirection and as said impeller engages the inner wall of portion llig,the water is moved around or squeezedv around the impeller and passesout at the discharge opening Hip into chamber Iliq. The water isdischarged upwardly through discharge opening 32a and into pipe 4! whereit passes to the circulating passages in the cylinder block and otherparts.

From the above description it will be seen that I have provided a verysimple, compact and efiicient structure of outboard motor. The pumpchamber Hid is conveniently located in the top of casting Hi and theparts are readily accessib e y A curved rib or partition Hig removingthe studs l2 and I4 so that member [3 and plate 32 can be lifted. Thedrive for the pump is conveniently taken from shaft 2| adjacent bearings20 and the cam 31 and impeller 38 are directly above the flange on upperbushing 20. The propeller drive parts are easily andconvenientlyassembled due to the removability of members I! and IS. The parts are soarranged that the cam 31 and impeller 38 are kept in the desiredalinement with shaft 2 I. The pipe M is conveniently secured in the lugor flange on member I3. The structure has been amply demonstrated inactual practice, found to be very successful and eflicient and is beingcommercially made.

It will, of course, be understood that various changes may be made inthe form, details, arrangement and proportions of the parts, withoutdeparting from the scope of applicants invention, which generallystated, consists in a device capable of carrying out the objects aboveset forth, in the parts and combinations of parts disclosed and definedin the appended claims.

What'is claimed is:

i. A pump structure comprising a casting having an elongated chambertherein at its top, a vertically extending drive shaft extending throughsaid chamber and journaled in said casting below said chamber, a diskeccentrically carried by said shaft, a substantially cylindricalimpeller having a bore in which said disk is disposed, a casing in saidchamber extending about said impeller having a substantially cylindricalwall of greater diameter than said impeller, said impeller having aprojection extending at one side thereof, spaced members in said chamberdirectly engaging the sides of said projection so that said impeller canbe oscillated therebetween, one of said members extending to the wall ofsaid chamber, said casing having a portion extending to the oppositewall of said chamber and forming with said last mentioned member andwall an inlet portion of said chamber, said casting having openingstherethrough into said portion, said casing. and said one of said spacedmembers also forming a discharge portion of said chamber, said casinghaving openings communicating with said portions respectively and anoutlet passage leading from said discharge portion.

2. A pump structure for an outboard motor having in combination, acasting of general bicuspid shape in horizontal cross section, the samehaving a wall forming an elongated chamber therein having asubstantially flat bottom, a plate forming the top of said chamber, ashaft extending vertically through said casting, chamber and plate, acylindrical disk secured to said shaft eccentrically thereof, acylindrical impeller member of resilient material having an axial borein which said disk fits, said impeller having an arm projecting at oneside thereof and toward one end of said chamber, a lug upstanding fromsaid bottom having a curved convex surface at one side, a curvedplate-like lug extending from one side of said wall having a convexsurface spaced from and adjacent said surface of said lug, said armbeing disposed between and oscillatable between said convex surfaces, aV semi-cylindrical wall spaced from said wall embracing said impellerforming a pump chamber thereabout and having an end connected to saidwall, said curved lug and the end of said semi-cylindrical wall definingan inlet opening into said pump chamber and said upstanding lug and saidend of said semi-cylindrical wall connected to said first mentioned wallforming an outlet passage from said pump chame her, said block beinggyrated in said last mentioned chamber by rotation of said disk.

3. The structure set forth in claim 2, said first mentioned chamberhaving a portion communicating with and receiving from said outletpassage, a discharge conduit extending vertically from said portion atone end thereof, said first mentioned chamber having a portion at itsopposite end communicating with said inlet passage and one end of saidwall having apertures leading from said last mentioned portion to theoutside of said first mentioned Wall through which water enters.

4. The structure set forth in claim 2, a bushing in said casting belowsaid chamber in which said shaft is journaled, a' thin fiber washerbetween said disk and plate for preventing abrasion of said plate, and athin metallic washer between said disk and bushing for preventingabrasion of said bushing.

. DANIEL A. ARMSTRONG.

REFERENCES CITED The following references are of record in the file ofthis pa ent:

UNITED STATES PATENTS

